Rodi unit help

[btuck887]

Picked up a second hand spectra pure 90 GDP rodi unit. Set it up and am getting a ration of 7:1 which is way to high. Is there any place in the city that carried flow restrictions? Theinstructions say u want a 4:1 ration but at 7:1 will u still get "good" water? Also where in the city can I pick up cheap filter replacements?

Thanks

[Magickiwi]

That's a high rejection rate. I think you need to shorten the flow restrictor. Check the manufactures website, they have manuals for all their units online.

[btuck887]

Wouldn't I need. Longer flow restrictor to restrict more of the waste water?

[btuck887]

One more question regarding rodi units. I set up the unit and it's producing 2-3 ppm water which I'm fine with but what other tests do I need to do on the water before I know it's safe for the tank? Or is a tds meter test all I need to do?

Thanks in advance

[ronau]

How old was the unit? Membranes can be permanently damaged if they let it dry out. I think Home Depot or any other reno store is the cheapest for sediment and carbon filters. Not sure what other tests you could do on RO water. I think that is why RO/DI is preferred, water is stripped down as practically possible.

[btuck887]

Originally Posted by ronau

How old was the unit? Membranes can be permanently damaged if they let it dry out. I think Home Depot or any other reno store is the cheapest for sediment and carbon filters. Not sure what other tests you could do on RO water. I think that is why RO/DI is preferred, water is stripped down as practically possible.

I picked it up used and it still had water in it when I got it so I'm assuming they had just takin it down. It is an rodi unit so with it producing water with 2 -3 ppm I shouldn't have to do any other test on the water and it should be ok to use for mixing salt? I have never used one before so I'm just a little worried about putting the water in the tank without asking some questions first ha ha